handling the build api error for PR#2013

Author: zhlsunshine

common-protos/istio.io/extensions/field_feature.proto

@@ -0,0 +1,33 @@
+// Copyright 2019 Istio Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package istio.extensions;
+
+option go_package="istio.io/api/extensions";
+
+import "google/protobuf/descriptor.proto";
+
+// Values applied at the field level
+extend google.protobuf.FieldOptions {
+	IstioFeature feature = 1300;
+}
+
+// These options should be used during schema definition,
+// applying them to some of the fields in protobuf
+message IstioFeature {
+	optional string status = 1;
+	optional string name = 2;
+}